-- C language pack: keymaps
-- We add LSP-powered maps *only when* clangd attaches, so they are buffer-local to C/C++.

local function buf_map(buf, mode, lhs, rhs, desc)
  vim.keymap.set(mode, lhs, rhs, { buffer = buf, silent = true, noremap = true, desc = desc })
end

-- Switch between header/source (create if missing)
vim.keymap.set("n", "<leader>ah", function()
  require("c.utils").toggle_header_source()
end, { desc = "C: alternate header/source" })

-- which-key label (buffer-local) if you like:
local ok, wk = pcall(require, "which-key")
if ok then wk.add({ { "<leader>a", group = "Alternate" } }) end

-- When any LSP attaches, check if it's clangd on a C/C++ buffer and map keys.
vim.api.nvim_create_autocmd("LspAttach", {
  callback = function(args)
    local client = vim.lsp.get_client_by_id(args.data.client_id)
    local buf    = args.buf
    local ft     = vim.bo[buf].filetype
    if not client or client.name ~= "clangd" then return end
    if ft ~= "c" and ft ~= "cpp" then return end

    -- === Navigation & refactoring (clangd) ===
    buf_map(buf, "n", "gd", vim.lsp.buf.definition,        "LSP: go to definition")
    buf_map(buf, "n", "gD", vim.lsp.buf.declaration,        "LSP: go to definition")
    buf_map(buf, "n", "gr", vim.lsp.buf.references,        "LSP: references")
    buf_map(buf, "n", "K",  vim.lsp.buf.hover,             "LSP: hover docs")
    buf_map(buf, "n", "<leader>rn", vim.lsp.buf.rename,    "LSP: rename symbol")
    buf_map(buf, "n", "<leader>ca", vim.lsp.buf.code_action,"LSP: code action")
    buf_map(buf, "n", "]d", vim.diagnostic.goto_next,      "Diag: next")
    buf_map(buf, "n", "[d", vim.diagnostic.goto_prev,      "Diag: prev")

    -- Format now (uses Conform with clang-format or LSP fallback)
    buf_map(buf, "n", "<leader>cf", function()
      local ok, conform = pcall(require, "conform")
      if ok then conform.format({ bufnr = buf, lsp_fallback = true }) end
    end, "C: format buffer")

    -- === Build / Quickfix (make) ===
    buf_map(buf, "n", "<leader>mm", "<cmd>make<CR>",       "Make: build")
    buf_map(buf, "n", "<leader>mb", "<cmd>make bear<CR>",       "Make: build")
    buf_map(buf, "n", "<leader>mo", "<cmd>copen<CR>",      "Quickfix: open")
    buf_map(buf, "n", "<leader>mn", "<cmd>cnext<CR>",      "Quickfix: next")
    buf_map(buf, "n", "<leader>mp", "<cmd>cprev<CR>",      "Quickfix: prev")

    -- which-key: label these groups for *this buffer only*
    local ok, wk = pcall(require, "which-key")
    if ok then
      wk.add({
        { "<leader>c", group = "C / LSP" },
        { "<leader>m", group = "Make / Quickfix" },
      }, { buffer = buf })
    end
  end,
})